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Type: Mammal
Diet:
Chipmunks have an omnivorous diet 雜食性 primarily consisting of seeds, nuts and other fruits, and buds.[11][12] They also commonly eat grass, shoots, and many other forms of plant matter, as well as fungi, insects and other arthropods, small frogs, worms, and bird eggs.[11][12][13][14][15][16]
At the beginning of autumn, many species of chipmunk begin to stockpile nonperishable foods for winter. They mostly cache their foods in a larder in their burrows and remain in their nests until spring, unlike some other species, which make multiple small caches of food.[11] Cheek pouches allow chipmunks to carry multiple food items to their burrows for either storage or consumption.[12]

Ecology and life history:

Eastern chipmunks mate in early spring and again in early summer, producing litters of four or five young twice each year.[11] Western chipmunks breed only once a year. The young emerge from the burrow after about six weeks and strike out on their own within the next two weeks.[19]
Chipmunks construct expansive burrows which can be more than 3.5 m in length with several well-concealed entrances. The sleeping quarters are kept extremely clean as shells and feces are stored in refuse tunnels.[citation needed]
The eastern chipmunk hibernates in the winter, while western chipmunks do not, relying on the stores in their burrows.[21]
Chipmunks typically live about three years, although have been observed living to nine years in captivity.[22]
Chipmunks in captivity are said to sleep for an average of about 15 hours a day. It is thought that mammals which can sleep in hiding, such as rodents and bats, tend to sleep longer than those that must remain on alert.[23]

further more :http://animals.nationalgeographic.com/animals/mammals/chipmunk/#
Lively and speedy critters, chipmunks are small members of the squirrel family. Their pudgy cheeks, large, glossy eyes, stripes, and bushy tails have made them a favorite among animators, and landed them a series of starring roles in Hollywood.
Of the 25 species of chipmunks, all but one, Asia’s Tamias sibiricus, is found in North America. Ranging from Canada to Mexico, they are generally seen scampering through the undergrowth of a variety of environments from alpine forests to shrubby deserts. Some dig burrows to live in, complete with tunnels and chambers, while others make their homes in nests, bushes, or logs.
Depending on species, chipmunks can be gray to reddish-brown in color with contrasting dark and light stripes on the sides of their face and across their back and tail. They range in size from the least chipmunk, which, at 7.2 to 8.5 inches (18.5 to 21.6 centimeters) and 1.1 to 1.8 ounces (32 to 50 grams), is the smallest chipmunk, to the Eastern chipmunk, which grows up to 11 inches (28 centimeters) and weighs as much as 4.4 ounces (125 grams).
Chipmunks generally gather food on the ground in areas with underbrush, rocks, and logs, where they can hide from predators like hawks, foxes, coyotes, weasels, and snakes. They feed on insects, nuts, berries, seeds, fruit, and grain which they stuff into their generous cheek pouches and carry to their burrow or nest to store. Chipmunks hibernate, but instead of storing fat, they periodically dip into their cache of nuts and seeds throughout the winter.
Their shrill, repeated, birdlike chirp is usually made upon sensing a threat but is also thought to be used as a mating call by females. Chipmunks are solitary creatures and normally ignore one another except during the spring, when mating takes place. After a 30-day gestation, a litter of two to eight is born. The young stay with their parents for two months before they begin to gather their own provisions for the winter ahead.
For the most part, chipmunks, although susceptible to forest fragmentation, are not currently threatened. However, the Palmer’s chipmunk (Tamias palmeri) is considered a vulnerable species.

Interesting Facts :
Chipmunks have a distinct way of communicating with each other. They make shrill bird-like chirping sounds and use gestures to communicate with each other.
Most of the species have alternating dark and light stripes on their body.
Though its mouth is very small, its cheeks can expand to three times its head size.
They have pouches in their cheeks. These pouches allow them to keep food in their cheeks till they can transfer it to their burrows.
They burrow a main tunnel where they rest and give birth to their young ones, the rest of the tunnels are dug for storing food.
One chipmunk may store up to 8 pounds of food in its burrows.
They place leaves and grasses in their main burrow so that they can rest comfortably and give birth to their young ones.
They take an average of 75 breaths in a minute.
They can be extremely territorial in the area around their burrow or nest. Their home range may be up to ½ acre (0.2 ha), but the adult only defends a territory about 50 feet (15.2 m) around the burrow entrance.
They are very active during the early morning and late afternoon.
Their mating period begins from the month of February to April. The number of young ones lies between 1 to 9. They may have around 4 to 5 young ones twice a year.